A body throws a ball to his friend $20 m$ away. The ball reaches to the friend in $4 s$ . The friend then throws the ball back to boy and it reaches the boy in $5 s$

The average velocity is

\frac{40}{9} m s^{- 1}

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The average acceleration is zero

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The average velocity is zero but average acceleration is non zero.

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Average acceleration of the motion cannot be defined

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Solution

The correct option is C The average velocity is zero but average acceleration is non zero.
As net displacement is zero, so average velocity is zero but average acceleration is non-zero since $g$ acts on ball

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A body throws a ball to his friend 20m away. The ball reaches to the friend in 4s. The friend then throws the ball back to boy and it reaches the boy in 5s

The correct option is C The average velocity is zero but average acceleration is non zero.As net displacement is zero, so average velocity is zero but average acceleration is non-zero since g acts on ball

A body throws a ball to his friend $20 m$ away. The ball reaches to the friend in $4 s$ . The friend then throws the ball back to boy and it reaches the boy in $5 s$

The correct option is C The average velocity is zero but average acceleration is non zero.
As net displacement is zero, so average velocity is zero but average acceleration is non-zero since $g$ acts on ball